Accessing Shark tables (Hive) from Scala (shark-shell) - scala

Question

I have shark-0.8.0 which runs on hive-0.9.0. I am able to program on Hive by invoking shark. I created a few tables and loaded them with data.
Now, I am trying to access the data from these tables using Scala. I invoked the Scala shell using shark-shell. But when I try to select, I get an error that the table is not present.
scala> val artists = sc.sql2rdd("select artist from default.lastfm")
Hive history file=/tmp/hduser2/hive_job_log_hduser2_201405091617_1513149542.txt
151.738: [GC 317312K->83626K(1005568K), 0.0975990 secs]
151.836: [Full GC 83626K->76005K(1005568K), 0.4523880 secs]
152.313: [GC 80536K->76140K(1005568K), 0.0030990 secs]
152.316: [Full GC 76140K->62214K(1005568K), 0.1716240 secs]
FAILED: Error in semantic analysis: Line 1:19 Table not found 'lastfm'
shark.api.QueryExecutionException: FAILED: Error in semantic analysis: Line 1:19 Table not found 'lastfm'
at shark.SharkDriver.tableRdd(SharkDriver.scala:149)
at shark.SharkContext.sql2rdd(SharkContext.scala:100)
at <init>(<console>:17)
at <init>(<console>:22)
at <init>(<console>:24)
at <init>(<console>:26)
at <init>(<console>:28)
at <init>(<console>:30)
at <init>(<console>:32)
at .<init>(<console>:36)
at .<clinit>(<console>)
at .<init>(<console>:11)
at .<clinit>(<console>)
at $export(<console>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:629)
at org.apache.spark.repl.SparkIMain$Request$$anonfun$10.apply(SparkIMain.scala:890)
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
at java.lang.Thread.run(Thread.java:744)
From the documentation (https://github.com/amplab/shark/wiki/Shark-User-Guide), these steps are enough to get Shark up and running and select data using Scala. Or am I missing something? Is there some configuration file that needs to be modified to enable access to Shark from shark-shell ?

Answer 1

Have you updated your shark-hive directory configuration to properly reflect the hive metastore jdbc connection info?
You will need to copy the hive-default.xml to hive-site.xml . Then ensure the metastore properties are set.
Here is the basic info in hive-site.xml
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://myhost/metastore</value>
<description>the URL of the MySQL database</description>
</property>
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
</property>
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>hive</value>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>mypassword</value>
</property>
You can get more details here: configuring hive metastore